US PATENT SUBCLASS 251 / 277
.~.~ Biased

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
264  DF  .~ Screw {5}
277.~.~ Biased {1}
278  DF  .~.~.~> Spring

DEFINITION

Classification: 251/277

(under subclass 264) Devices wherein the valve is biased to open or closed position.